ArchGen

Library Management System Architecture

Focus: Catalog + Circulation + Self-Checkout. Key areas: React, Next.js, OAuth2.

Use this as a block diagram of the system when explaining architecture.

Preview
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Diagram caption: Library Management System Architecture (Catalog + Circulation + Self-Checkout) has 4 layers: User Experience & Access, Core Services, Data & Messaging, Platform & Security.

Prompt

System architecture diagram for a library management system. Patrons use a web portal to search the catalog, reserve books, and manage loans; librarians use an admin console for acquisitions, cataloging, and circulation. Include self-checkout kiosks with barcode/RFID scanners. Core services should cover catalog, circulation, membership/fines, and notification workflows. Store transactional data in PostgreSQL, index titles in Elasticsearch, and cache sessions in Redis. Use a message bus for loan events and overdue reminders. Authentication should use OAuth2 with RBAC for staff roles and audit logging for changes.
Highlights
  • Layer details · Core Services: Modules include Catalog Service, Circulation Service, Membership & Fines.
  • Layer details · User Experience & Access: Modules include Patron Web Portal, Librarian Console, Self-Checkout Kiosks.
  • Module responsibilities · User Experience & Access / Librarian Console: Manage inventory; Process checkouts; Handle holds

Overview

Library Management System Architecture (Catalog + Circulation + Self-Checkout) has 4 layers: User Experience & Access, Core Services, Data & Messaging, Platform & Security.

Layer details

Show all (4)
  • User Experience & Access: Modules include Patron Web Portal, Librarian Console, Self-Checkout Kiosks.
  • Core Services: Modules include Catalog Service, Circulation Service, Membership & Fines.
  • Data & Messaging: Modules include Transactional Database, Search Index, Event & Notification Bus.
  • Platform & Security: Modules include Identity & RBAC, Audit & Compliance, Monitoring & Backup.

Module responsibilities

Show all (12)
  • User Experience & Access / Patron Web Portal: Provide self-service access; Display availability; Submit reservations
  • User Experience & Access / Librarian Console: Manage inventory; Process checkouts; Handle holds
  • User Experience & Access / Self-Checkout Kiosks: Automate checkouts; Validate membership; Sync transactions
  • Core Services / Catalog Service: Maintain catalog data; Expose search APIs; Sync with index
  • Core Services / Circulation Service: Enforce policies; Update availability; Emit loan events
  • Core Services / Membership & Fines: Manage memberships; Assess penalties; Track payments
  • Data & Messaging / Transactional Database: Persist transactions; Support reporting; Enforce ACID
  • Data & Messaging / Search Index: Index catalog data; Serve search queries; Handle autocomplete
  • Data & Messaging / Event & Notification Bus: Decouple services; Trigger notifications; Maintain retries
  • Platform & Security / Identity & RBAC: Authenticate users; Authorize staff actions; Issue JWTs
  • Platform & Security / Audit & Compliance: Track sensitive changes; Support audits; Export reports
  • Platform & Security / Monitoring & Backup: Observe uptime; Detect incidents; Recover data

Key flows

Show all (3)
  • Discovery flow: patrons search the catalog, Catalog Service queries PostgreSQL and Elasticsearch, and results return to the web portal with availability status.
  • Loan flow: a checkout from kiosk or librarian console hits Circulation Service, updates inventory in PostgreSQL, and emits loan events to Kafka for reminders.
  • Compliance flow: staff actions are authorized via RBAC, logged to audit storage, and monitored by alerting dashboards.